diff --git a/lib/MC/TargetAsmBackend.cpp b/lib/MC/TargetAsmBackend.cpp
index e0653d0..b13aa1d 100644
--- a/lib/MC/TargetAsmBackend.cpp
+++ b/lib/MC/TargetAsmBackend.cpp
@@ -27,7 +27,8 @@
     { "FK_Data_8", 0, 64, 0 },
     { "FK_PCRel_1", 0, 8, MCFixupKindInfo::FKF_IsPCRel },
     { "FK_PCRel_2", 0, 16, MCFixupKindInfo::FKF_IsPCRel },
-    { "FK_PCRel_4", 0, 32, MCFixupKindInfo::FKF_IsPCRel }
+    { "FK_PCRel_4", 0, 32, MCFixupKindInfo::FKF_IsPCRel },
+    { "FK_PCRel_8", 0, 64, MCFixupKindInfo::FKF_IsPCRel }
   };
   
   assert(Kind <= sizeof(Builtins) / sizeof(Builtins[0]) &&